the sum of ap with 15 term is 180 then the 8 term is
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Step-by-step explanation:
Sn = n/2[ 2a + ( n - 1 ) d ]
180 = 15/2[ 2a + ( 15 - 1 ) d ]
180 = 15/2 ( 2a + 14 d)
180/15 = 1/2 ( 2 a + 14 d)
180/15 = a + 7d
a + 7d = 12
a8 = a + 7 d
a8 =12
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